2011•Unpublished venueRequires access
Study on the Dewatering Characteristics and Efficiency of Thickening Low Concentration Excess Sludge by Cavitation Air Floatation (CAF)
Ju De-jin, Fengping Hu, Wang Lin-yuan
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Abstract
In order to study the dewatering characteristics and efficiency of thickening low concentration excess sludge by Cavitation Air Floatation(CAF), As CAF-5 is employed to thicken low concentration excess sludge in Chaoyangzhou WWPT, the influent flow is 5m3/h, the sludge concentration is 4g/L, the dosage of flocculant FO4440SH is 1.0 kg/tDS and the dosage of surfactant 1227 is 0.2 kg/tDS, the solid content ratio of thickening sludge is 6~7%, the sludge specific resistance to filtration is 2~2.5 × 1012m/kg. When the thickening sludge is dewatered directly by the sludge pressafiner, the solid content ratio of dewatering sludge is up to 22.4~23.8%. Comparing with that of dewatering sludge by integrated thicken-dewater machine of 20.5~22.2%, the dewatering characteristics of CAF is better, and the solid content ratio of dewatering sludge is higher.